Fuel metering system for a gas turbine engine
AssigneeSociete Nationale d'Etude et de Construction de Meteur d'Aviation-"S.N.E. C.M.A."
InventorRaymond Puillet
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Abstract
A fuel metering system for a gas turbine engine is disclosed which includes two rotating flowmeters connected to the fuel supply circuit in parallel. The speed of the flowmeters are controlled by a pair of braking motors and tachometers are provided in each to provide an output signal of their rotational speeds. A control circuit is connected to the system to regulate the speed of the flowmeters to insure that the total fuel flow coincides with a reference value. Should a malfunction occur in one of the flowmeter systems, the control circuit may regulate the speed of the remaining flowmeter to retain the total fuel flow at the reference value.
Claims11
A fuel metering system for a gas turbine engine having a fuel supply line emanating from a fuel source, the system comprising:
- (a) first and second rotating flowmeters;
- (b) inlet conduit means connecting inlets of the first and second flowmeters in parallel to the fuel supply line;
- (c) outlet conduit means connecting outlets of the first and second flowmeters in parallel to a fuel outlet line;
- (d) first and second torque generators rotatably coupled to the first and second flowmeters, respectively;
- (e) first and second tachometer means drivingly coupled to the first and second flowmeters, respectively, so as to rotate therewith, each of the first and second tachometer means producing an output signal proportional to its rotational speed;
- (f) means for generating a reference signal for the desired value of total fuel flow through the fuel outlet line;
- and,
- (g) control circuit means connected to the reference signal generating means, the outputs of the first and second tachometer means and the first and second torque generators so as to control the first and second torque generators such that the total fuel flow through the fuel outlet line remains approximately at the desired value.
Dependencies are inferred from the claim text.